99972289 has 2 divisors, whose sum is σ = 99972290. Its totient is φ = 99972288.

The previous prime is 99972287. The next prime is 99972311. The reversal of 99972289 is 98227999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96040000 + 3932289 = 9800^2 + 1983^2 .

It is a cyclic number.

It is not a de Polignac number, because 99972289 - 2¹ = 99972287 is a prime.

Together with 99972287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99972287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49986144 + 49986145.

It is an arithmetic number, because the mean of its divisors is an integer number (49986145).

Almost surely, 2^99972289 is an apocalyptic number.

It is an amenable number.

99972289 is a deficient number, since it is larger than the sum of its proper divisors (1).

99972289 is an equidigital number, since it uses as much as digits as its factorization.

99972289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 55.

The square root of 99972289 is about 9998.6143539993. The cubic root of 99972289 is about 464.1160050443.

The spelling of 99972289 in words is "ninety-nine million, nine hundred seventy-two thousand, two hundred eighty-nine".